transmission

[dre2992]

what could cause the transmission to jump out of gear and what can make it hard to shift up but not down

 

[Blaner]

A number of things. We need more info.

• Have you recently had the casings apart?
• What transmission oil do you run?
• have you checked your transmission oil?
• How does your clutch feel? (floppy/tight/non functional)
• Did you experience anything unusual (Clunk/bang/lock up/bent shift fork)?

Jumping out of gear could be related to the shift star and its mechanism, but give some info and I can help you further.

 

[KTM RACING 559]

Jumping out of gear is usually worn engagment dogs "gears" in the transmission , hard to shift is possibly a bent shift shaft, worn shift drum or shift forks. try checking your oil level and the condition of the oil.

 

[dre2992]

theres new oil in it and no i have never split the case

 

[Blaner]

Start by removing the right hand side clutch cover. That means kickstarter etc.

• Remove spark plug, jack the back wheels off the ground and roll them forward, while doing so, see if you can shift into all 6 gears and down to 1st again
• Remove the shift shaft
• Inspect the shaft for a bend
• Inspect shift star for worn/damaged teeth
• Pull clutch lever and watch to see if the clutch plates are moving (engaging/disengaging)

If all is well there but you cannot find gears, you going to have to dive deeper and spilt the cases and investigate worn or bent shift forks.